Which two floral whorls are called the 'essential whorls' of a flower?

1. A flower has four whorls: calyx, corolla, androecium and gynoecium. 2. Whorls are grouped as essential (reproductive) or accessory (protective). 3. Calyx (sepals) and corolla (petals) only protect inner parts, so they are accessory. 4. So the calyx-corolla and sepals-petals pairs in A and B are accessory and ruled out. 5. Pedicel is a stalk and stigma is part of the carpel, not whorls, so C is ruled out. 6. Androecium and gynoecium carry out reproduction, so they are the essential whorls. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 3 "Life Processes in Living Organisms Part 2", p.35_